Class: Ruby2Ruby

Inherits:
SexpProcessor
  • Object
show all
Defined in:
lib/ruby2ruby.rb

Overview

Generate ruby code from a sexp.

Constant Summary collapse

VERSION =

:nodoc:

"2.0.8"
LINE_LENGTH =

cutoff for one-liners

78
BINARY =

binary operation messages

[:<=>, :==, :<, :>, :<=, :>=, :-, :+, :*, :/, :%, :<<, :>>, :**, :'!=']
ASSIGN_NODES =

Nodes that represent assignment and probably need () around them.

TODO: this should be replaced with full precedence support :/

[
 :dasgn,
 :flip2,
 :flip3,
 :lasgn,
 :masgn,
 :attrasgn,
 :op_asgn1,
 :op_asgn2,
 :op_asgn_and,
 :op_asgn_or,
 :return,
 :if, # HACK
 :rescue,
]

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Ruby2Ruby

:nodoc:



61
62
63
64
65
66
67
68
69
70
71
 
# File 'lib/ruby2ruby.rb', line 61

def initialize # :nodoc:
  super
  @indent = "  "
  self.auto_shift_type = true
  self.strict = true
  self.expected = String

  @calls = []

  # self.debug[:defn] = /zsuper/
end

Instance Method Details

#cond_loop(exp, name) ⇒ Object

Generate a post-or-pre conditional loop.



952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
 
# File 'lib/ruby2ruby.rb', line 952

def cond_loop(exp, name)
  cond = process(exp.shift)
  body = process(exp.shift)
  head_controlled = exp.shift

  body = indent(body).chomp if body

  code = []
  if head_controlled then
    code << "#{name} #{cond} do"
    code << body if body
    code << "end"
  else
    code << "begin"
    code << body if body
    code << "end #{name} #{cond}"
  end
  code.join("\n")
end

#dthing_escape(type, lit) ⇒ Object

Utility method to escape something interpolated.



975
976
977
978
979
980
981
982
983
984
985
986
987
 
# File 'lib/ruby2ruby.rb', line 975

def dthing_escape type, lit
  lit = lit.gsub(/\n/, '\n')
  case type
  when :dregx then
    lit.gsub(/(\A|[^\\])\//, '\1\/')
  when :dstr, :dsym then
    lit.gsub(/"/, '\"')
  when :dxstr then
    lit.gsub(/`/, '\`')
  else
    raise "unsupported type #{type.inspect}"
  end
end

#finish(exp) ⇒ Object

Process all the remaining stuff in exp and return the results sans-nils.



993
994
995
996
997
998
999
 
# File 'lib/ruby2ruby.rb', line 993

def finish exp # REFACTOR: work this out of the rest of the processors
  body = []
  until exp.empty? do
    body << process(exp.shift)
  end
  body.compact
end

#indent(s) ⇒ Object

Indent all lines of s to the current indent level.



1004
1005
1006
 
# File 'lib/ruby2ruby.rb', line 1004

def indent(s)
  s.to_s.split(/\n/).map{|line| @indent + line}.join("\n")
end

#parenthesize(exp) ⇒ Object

Wrap appropriate expressions in matching parens.



1011
1012
1013
1014
1015
1016
1017
1018
 
# File 'lib/ruby2ruby.rb', line 1011

def parenthesize exp
  case self.context[1]
  when nil, :defn, :defs, :class, :sclass, :if, :iter, :resbody, :when, :while then
    exp
  else
    "(#{exp})"
  end
end

#process_alias(exp) ⇒ Object

Processors



76
77
78
 
# File 'lib/ruby2ruby.rb', line 76

def process_alias(exp) # :nodoc:
  parenthesize "alias #{process(exp.shift)} #{process(exp.shift)}"
end

#process_and(exp) ⇒ Object

:nodoc:



80
81
82
 
# File 'lib/ruby2ruby.rb', line 80

def process_and(exp) # :nodoc:
  parenthesize "#{process exp.shift} and #{process exp.shift}"
end

#process_arglist(exp) ⇒ Object

custom made node # :nodoc:



84
85
86
87
88
89
90
91
92
93
 
# File 'lib/ruby2ruby.rb', line 84

def process_arglist(exp) # custom made node # :nodoc:
  code = []
  until exp.empty? do
    arg = exp.shift
    to_wrap = arg.first == :rescue
    arg_code = process arg
    code << (to_wrap ? "(#{arg_code})" : arg_code)
  end
  code.join ', '
end

#process_args(exp) ⇒ Object

:nodoc:



95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
 
# File 'lib/ruby2ruby.rb', line 95

def process_args(exp) # :nodoc:
  args = []

  until exp.empty? do
    arg = exp.shift
    case arg
    when Symbol then
      args << arg
    when Sexp then
      case arg.first
      when :lasgn then
        args << process(arg)
      when :masgn then
        args << process(arg)
      else
        raise "unknown arg type #{arg.first.inspect}"
      end
    else
      raise "unknown arg type #{arg.inspect}"
    end
  end

  "(#{args.join ', '})"
end

#process_array(exp) ⇒ Object

:nodoc:



120
121
122
 
# File 'lib/ruby2ruby.rb', line 120

def process_array(exp) # :nodoc:
  "[#{process_arglist(exp)}]"
end

#process_attrasgn(exp) ⇒ Object

:nodoc:



124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
 
# File 'lib/ruby2ruby.rb', line 124

def process_attrasgn(exp) # :nodoc:
  receiver = process exp.shift
  name = exp.shift
  rhs  = exp.pop
  args = s(:array, *exp)
  exp.clear

  case name
  when :[]= then
    args = process args
    "#{receiver}#{args} = #{process rhs}"
  else
    raise "dunno what to do: #{args.inspect}" unless args.size == 1 # s(:array)
    name = name.to_s.sub(/=$/, '')
    if rhs && rhs != s(:arglist) then
      "#{receiver}.#{name} = #{process(rhs)}"
    else
      raise "dunno what to do: #{rhs.inspect}"
    end
  end
end

#process_back_ref(exp) ⇒ Object

:nodoc:



146
147
148
 
# File 'lib/ruby2ruby.rb', line 146

def process_back_ref(exp) # :nodoc:
  "$#{exp.shift}"
end

#process_begin(exp) ⇒ Object

TODO: figure out how to do rescue and ensure ENTIRELY w/o begin



151
152
153
154
155
156
157
158
159
160
161
 
# File 'lib/ruby2ruby.rb', line 151

def process_begin(exp) # :nodoc:
  code = []
  code << "begin"
  until exp.empty?
    src = process(exp.shift)
    src = indent(src) unless src =~ /(^|\n)(rescue|ensure)/ # ensure no level 0 rescues
    code << src
  end
  code << "end"
  return code.join("\n")
end

#process_block(exp) ⇒ Object

:nodoc:



163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
 
# File 'lib/ruby2ruby.rb', line 163

def process_block(exp) # :nodoc:
  result = []

  exp << nil if exp.empty?
  until exp.empty? do
    code = exp.shift
    if code.nil? or code.first == :nil then
      result << "# do nothing\n"
    else
      result << process(code)
    end
  end

  result = parenthesize result.join "\n"
  result += "\n" unless result.start_with? "("

  return result
end

#process_block_pass(exp) ⇒ Object

:nodoc:



182
183
184
185
186
 
# File 'lib/ruby2ruby.rb', line 182

def process_block_pass exp # :nodoc:
  raise "huh?: #{exp.inspect}" if exp.size > 1

  "&#{process exp.shift}"
end

#process_break(exp) ⇒ Object

:nodoc:



188
189
190
191
192
193
194
195
196
 
# File 'lib/ruby2ruby.rb', line 188

def process_break(exp) # :nodoc:
  val = exp.empty? ? nil : process(exp.shift)
  # HACK "break" + (val ? " #{val}" : "")
  if val then
    "break #{val}"
  else
    "break"
  end
end

#process_call(exp) ⇒ Object

:nodoc:



198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
 
# File 'lib/ruby2ruby.rb', line 198

def process_call(exp) # :nodoc:
  receiver_node_type = exp.first.nil? ? nil : exp.first.first
  receiver = process exp.shift
  receiver = "(#{receiver})" if ASSIGN_NODES.include? receiver_node_type

  name = exp.shift
  args = []

  # this allows us to do both old and new sexp forms:
  exp.push(*exp.pop[1..-1]) if exp.size == 1 && exp.first.first == :arglist

  @calls.push name

  in_context :arglist do
    until exp.empty? do
      arg_type = exp.first.sexp_type
      is_empty_hash = (exp.first == s(:hash))
      arg = process exp.shift

      next if arg.empty?

      strip_hash = (arg_type == :hash and
                    not BINARY.include? name and
                    not is_empty_hash and
                    (exp.empty? or exp.first.sexp_type == :splat))
      wrap_arg = Ruby2Ruby::ASSIGN_NODES.include? arg_type

      arg = arg[2..-3] if strip_hash
      arg = "(#{arg})" if wrap_arg

      args << arg
    end
  end

  case name
  when *BINARY then
    "(#{receiver} #{name} #{args.join(', ')})"
  when :[] then
    receiver ||= "self"
    "#{receiver}[#{args.join(', ')}]"
  when :[]= then
    receiver ||= "self"
    rhs = args.pop
    "#{receiver}[#{args.join(', ')}] = #{rhs}"
  when :"!" then
    "(not #{receiver})"
  when :"-@" then
    "-#{receiver}"
  when :"+@" then
    "+#{receiver}"
  else
    args     = nil                    if args.empty?
    args     = "(#{args.join(', ')})" if args
    receiver = "#{receiver}."         if receiver

    "#{receiver}#{name}#{args}"
  end
ensure
  @calls.pop
end

#process_case(exp) ⇒ Object

:nodoc:



259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
 
# File 'lib/ruby2ruby.rb', line 259

def process_case(exp) # :nodoc:
  result = []
  expr = process exp.shift
  if expr then
    result << "case #{expr}"
  else
    result << "case"
  end
  until exp.empty?
    pt = exp.shift
    if pt and pt.first == :when
      result << "#{process(pt)}"
    else
      code = indent(process(pt))
      code = indent("# do nothing") if code =~ /^\s*$/
      result << "else\n#{code}"
    end
  end
  result << "end"
  result.join("\n")
end

#process_cdecl(exp) ⇒ Object

:nodoc:



281
282
283
284
285
286
287
288
289
290
 
# File 'lib/ruby2ruby.rb', line 281

def process_cdecl(exp) # :nodoc:
  lhs = exp.shift
  lhs = process lhs if Sexp === lhs
  unless exp.empty? then
    rhs = process(exp.shift)
    "#{lhs} = #{rhs}"
  else
    lhs.to_s
  end
end

#process_class(exp) ⇒ Object

:nodoc:



292
293
294
 
# File 'lib/ruby2ruby.rb', line 292

def process_class(exp) # :nodoc:
  "#{exp.comments}class #{util_module_or_class(exp, true)}"
end

#process_colon2(exp) ⇒ Object

:nodoc:



296
297
298
 
# File 'lib/ruby2ruby.rb', line 296

def process_colon2(exp) # :nodoc:
  "#{process(exp.shift)}::#{exp.shift}"
end

#process_colon3(exp) ⇒ Object

:nodoc:



300
301
302
 
# File 'lib/ruby2ruby.rb', line 300

def process_colon3(exp) # :nodoc:
  "::#{exp.shift}"
end

#process_const(exp) ⇒ Object

:nodoc:



304
305
306
 
# File 'lib/ruby2ruby.rb', line 304

def process_const(exp) # :nodoc:
  exp.shift.to_s
end

#process_cvar(exp) ⇒ Object

:nodoc:



308
309
310
 
# File 'lib/ruby2ruby.rb', line 308

def process_cvar(exp) # :nodoc:
  "#{exp.shift}"
end

#process_cvasgn(exp) ⇒ Object

:nodoc:



312
313
314
 
# File 'lib/ruby2ruby.rb', line 312

def process_cvasgn(exp) # :nodoc:
  "#{exp.shift} = #{process(exp.shift)}"
end

#process_cvdecl(exp) ⇒ Object

:nodoc:



316
317
318
 
# File 'lib/ruby2ruby.rb', line 316

def process_cvdecl(exp) # :nodoc:
  "#{exp.shift} = #{process(exp.shift)}"
end

#process_defined(exp) ⇒ Object

:nodoc:



320
321
322
 
# File 'lib/ruby2ruby.rb', line 320

def process_defined(exp) # :nodoc:
  "defined? #{process(exp.shift)}"
end

#process_defn(exp) ⇒ Object

:nodoc:



324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
 
# File 'lib/ruby2ruby.rb', line 324

def process_defn(exp) # :nodoc:
  type1 = exp[1].first
  type2 = exp[2].first rescue nil
  expect = [:ivar, :iasgn, :attrset]

  # s(name, args, ivar|iasgn|attrset)
  if exp.size == 3 and type1 == :args and expect.include? type2 then
    name = exp.first # don't shift in case we pass through
    case type2
    when :ivar then
      ivar_name = exp.ivar.last

      meth_name = ivar_name.to_s[1..-1].to_sym
      expected = s(meth_name, s(:args), s(:ivar, ivar_name))

      if exp == expected then
        exp.clear
        return "attr_reader #{name.inspect}"
      end
    when :attrset then
      # TODO: deprecate? this is a PT relic
      exp.clear
      return "attr_writer :#{name.to_s[0..-2]}"
    when :iasgn then
      ivar_name = exp.iasgn[1]
      meth_name = "#{ivar_name.to_s[1..-1]}=".to_sym
      arg_name = exp.args.last
      expected = s(meth_name, s(:args, arg_name),
                   s(:iasgn, ivar_name, s(:lvar, arg_name)))

      if exp == expected then
        exp.clear
        return "attr_writer :#{name.to_s[0..-2]}"
      end
    else
      raise "Unknown defn type: #{exp.inspect}"
    end
  end

  comm = exp.comments
  name = exp.shift
  args = process exp.shift
  args = "" if args == "()"

  exp.shift if exp == s(s(:nil)) # empty it out of a default nil expression

  # REFACTOR: use process_block but get it happier wrt parenthesize
  body = []
  until exp.empty? do
    body << indent(process(exp.shift))
  end

  body << indent("# do nothing") if body.empty?

  body = body.join("\n")

  return "#{comm}def #{name}#{args}\n#{body}\nend".gsub(/\n\s*\n+/, "\n")
end

#process_defs(exp) ⇒ Object

:nodoc:



383
384
385
386
387
388
389
390
391
392
393
 
# File 'lib/ruby2ruby.rb', line 383

def process_defs(exp) # :nodoc:
  lhs  = exp.shift
  var = [:self, :cvar, :dvar, :ivar, :gvar, :lvar].include? lhs.first
  name = exp.shift

  lhs = process(lhs)
  lhs = "(#{lhs})" unless var

  exp.unshift "#{lhs}.#{name}"
  process_defn(exp)
end

#process_dot2(exp) ⇒ Object

:nodoc:



395
396
397
 
# File 'lib/ruby2ruby.rb', line 395

def process_dot2(exp) # :nodoc:
  "(#{process exp.shift}..#{process exp.shift})"
end

#process_dot3(exp) ⇒ Object

:nodoc:



399
400
401
 
# File 'lib/ruby2ruby.rb', line 399

def process_dot3(exp) # :nodoc:
  "(#{process exp.shift}...#{process exp.shift})"
end

#process_dregx(exp) ⇒ Object

:nodoc:



403
404
405
406
 
# File 'lib/ruby2ruby.rb', line 403

def process_dregx(exp) # :nodoc:
  options = re_opt exp.pop if Fixnum === exp.last
  "/" << util_dthing(:dregx, exp) << "/#{options}"
end

#process_dregx_once(exp) ⇒ Object

:nodoc:



408
409
410
 
# File 'lib/ruby2ruby.rb', line 408

def process_dregx_once(exp) # :nodoc:
  process_dregx(exp) + "o"
end

#process_dstr(exp) ⇒ Object

:nodoc:



412
413
414
 
# File 'lib/ruby2ruby.rb', line 412

def process_dstr(exp) # :nodoc:
  "\"#{util_dthing(:dstr, exp)}\""
end

#process_dsym(exp) ⇒ Object

:nodoc:



416
417
418
 
# File 'lib/ruby2ruby.rb', line 416

def process_dsym(exp) # :nodoc:
  ":\"#{util_dthing(:dsym, exp)}\""
end

#process_dxstr(exp) ⇒ Object

:nodoc:



420
421
422
 
# File 'lib/ruby2ruby.rb', line 420

def process_dxstr(exp) # :nodoc:
  "`#{util_dthing(:dxstr, exp)}`"
end

#process_ensure(exp) ⇒ Object

:nodoc:



424
425
426
427
428
429
430
431
432
433
434
435
 
# File 'lib/ruby2ruby.rb', line 424

def process_ensure(exp) # :nodoc:
  body = process exp.shift
  ens  = exp.shift
  ens  = nil if ens == s(:nil)
  ens  = process(ens) || "# do nothing"
  ens = "begin\n#{ens}\nend\n" if ens =~ /(^|\n)rescue/

  body.sub!(/\n\s*end\z/, '')
  body = indent(body) unless body =~ /(^|\n)rescue/

  return "#{body}\nensure\n#{indent ens}"
end

#process_evstr(exp) ⇒ Object

:nodoc:



437
438
439
 
# File 'lib/ruby2ruby.rb', line 437

def process_evstr(exp) # :nodoc:
  exp.empty? ? '' : process(exp.shift)
end

#process_false(exp) ⇒ Object

:nodoc:



441
442
443
 
# File 'lib/ruby2ruby.rb', line 441

def process_false(exp) # :nodoc:
  "false"
end

#process_flip2(exp) ⇒ Object

:nodoc:



445
446
447
 
# File 'lib/ruby2ruby.rb', line 445

def process_flip2(exp) # :nodoc:
  "#{process(exp.shift)}..#{process(exp.shift)}"
end

#process_flip3(exp) ⇒ Object

:nodoc:



449
450
451
 
# File 'lib/ruby2ruby.rb', line 449

def process_flip3(exp) # :nodoc:
  "#{process(exp.shift)}...#{process(exp.shift)}"
end

#process_for(exp) ⇒ Object

:nodoc:



453
454
455
456
457
458
459
460
461
462
463
 
# File 'lib/ruby2ruby.rb', line 453

def process_for(exp) # :nodoc:
  recv = process exp.shift
  iter = process exp.shift
  body = exp.empty? ? nil : process(exp.shift)

  result = ["for #{iter} in #{recv} do"]
  result << indent(body ? body : "# do nothing")
  result << "end"

  result.join("\n")
end

#process_gasgn(exp) ⇒ Object

:nodoc:



465
466
467
 
# File 'lib/ruby2ruby.rb', line 465

def process_gasgn(exp) # :nodoc:
  process_iasgn(exp)
end

#process_gvar(exp) ⇒ Object

:nodoc:



469
470
471
 
# File 'lib/ruby2ruby.rb', line 469

def process_gvar(exp) # :nodoc:
  return exp.shift.to_s
end

#process_hash(exp) ⇒ Object

:nodoc:



473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
 
# File 'lib/ruby2ruby.rb', line 473

def process_hash(exp) # :nodoc:
  result = []

  until exp.empty?
    lhs = process(exp.shift)
    rhs = exp.shift
    t = rhs.first
    rhs = process rhs
    rhs = "(#{rhs})" unless [:lit, :str].include? t # TODO: verify better!

    result << "#{lhs} => #{rhs}"
  end

  return result.empty? ? "{}" : "{ #{result.join(', ')} }"
end

#process_iasgn(exp) ⇒ Object

:nodoc:



489
490
491
492
493
494
495
496
 
# File 'lib/ruby2ruby.rb', line 489

def process_iasgn(exp) # :nodoc:
  lhs = exp.shift
  if exp.empty? then # part of an masgn
    lhs.to_s
  else
    "#{lhs} = #{process exp.shift}"
  end
end

#process_if(exp) ⇒ Object

:nodoc:



498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
 
# File 'lib/ruby2ruby.rb', line 498

def process_if(exp) # :nodoc:
  expand = Ruby2Ruby::ASSIGN_NODES.include? exp.first.first
  c = process exp.shift
  t = process exp.shift
  f = process exp.shift

  c = "(#{c.chomp})" if c =~ /\n/

  if t then
    unless expand then
      if f then
        r = "#{c} ? (#{t}) : (#{f})"
        r = nil if r =~ /return/ # HACK - need contextual awareness or something
      else
        r = "#{t} if #{c}"
      end
      return r if r and (@indent+r).size < LINE_LENGTH and r !~ /\n/
    end

    r = "if #{c} then\n#{indent(t)}\n"
    r << "else\n#{indent(f)}\n" if f
    r << "end"

    r
  elsif f
    unless expand then
      r = "#{f} unless #{c}"
      return r if (@indent+r).size < LINE_LENGTH and r !~ /\n/
    end
    "unless #{c} then\n#{indent(f)}\nend"
  else
    # empty if statement, just do it in case of side effects from condition
    "if #{c} then\n#{indent '# do nothing'}\nend"
  end
end

#process_iter(exp) ⇒ Object

:nodoc:



534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
 
# File 'lib/ruby2ruby.rb', line 534

def process_iter(exp) # :nodoc:
  iter = process exp.shift
  args = exp.shift
  body = exp.empty? ? nil : process(exp.shift)

  args = case args
         when 0 then
           " ||"
         else
           a = process(args)[1..-2]
           a = " |#{a}|" unless a.empty?
           a
         end

  b, e = if iter == "END" then
           [ "{", "}" ]
         else
           [ "do", "end" ]
         end

  iter.sub!(/\(\)$/, '')

  # REFACTOR: ugh
  result = []
  result << "#{iter} {"
  result << args
  if body then
    result << " #{body.strip} "
  else
    result << ' '
  end
  result << "}"
  result = result.join
  return result if result !~ /\n/ and result.size < LINE_LENGTH

  result = []
  result << "#{iter} #{b}"
  result << args
  result << "\n"
  if body then
    result << indent(body.strip)
    result << "\n"
  end
  result << e
  result.join
end

#process_ivar(exp) ⇒ Object

:nodoc:



581
582
583
 
# File 'lib/ruby2ruby.rb', line 581

def process_ivar(exp) # :nodoc:
  exp.shift.to_s
end

#process_kwsplat(exp) ⇒ Object 



585
586
587
 
# File 'lib/ruby2ruby.rb', line 585

def process_kwsplat(exp)
  "**#{process exp.shift}"
end

#process_lasgn(exp) ⇒ Object

:nodoc:



589
590
591
592
593
 
# File 'lib/ruby2ruby.rb', line 589

def process_lasgn(exp) # :nodoc:
  s = "#{exp.shift}"
  s += " = #{process exp.shift}" unless exp.empty?
  s
end

#process_lit(exp) ⇒ Object

:nodoc:



595
596
597
598
599
600
601
602
603
 
# File 'lib/ruby2ruby.rb', line 595

def process_lit(exp) # :nodoc:
  obj = exp.shift
  case obj
  when Range then
    "(#{obj.inspect})"
  else
    obj.inspect
  end
end

#process_lvar(exp) ⇒ Object

:nodoc:



605
606
607
 
# File 'lib/ruby2ruby.rb', line 605

def process_lvar(exp) # :nodoc:
  exp.shift.to_s
end

#process_masgn(exp) ⇒ Object

:nodoc:



609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
 
# File 'lib/ruby2ruby.rb', line 609

def process_masgn(exp) # :nodoc:
  # s(:masgn, s(:array, s(:lasgn, :var), ...), s(:to_ary, <val>, ...))
  # s(:iter, <call>, s(:args, s(:masgn, :a, :b)), <body>)

  case exp.first
  when Sexp then
    lhs = exp.shift
    rhs = exp.empty? ? nil : exp.shift

    case lhs.first
    when :array then
      lhs.shift # node type
      lhs = lhs.map do |l|
        case l.first
        when :masgn then
          "(#{process(l)})"
        else
          process(l)
        end
      end
    else
      raise "no clue: #{lhs.inspect}"
    end

    unless rhs.nil? then
      t = rhs.first
      rhs = process rhs
      rhs = rhs[1..-2] if t == :array # FIX: bad? I dunno
      return "#{lhs.join(", ")} = #{rhs}"
    else
      return lhs.join(", ")
    end
  when Symbol then # block arg list w/ masgn
    result = exp.join ", "
    exp.clear
    "(#{result})"
  else
    raise "unknown masgn: #{exp.inspect}"
  end
end

#process_match(exp) ⇒ Object

:nodoc:



650
651
652
 
# File 'lib/ruby2ruby.rb', line 650

def process_match(exp) # :nodoc:
  "#{process(exp.shift)}"
end

#process_match2(exp) ⇒ Object

:nodoc:



654
655
656
657
658
 
# File 'lib/ruby2ruby.rb', line 654

def process_match2(exp) # :nodoc:
  lhs = process(exp.shift)
  rhs = process(exp.shift)
  "#{lhs} =~ #{rhs}"
end

#process_match3(exp) ⇒ Object

:nodoc:



660
661
662
663
664
665
666
667
668
669
670
 
# File 'lib/ruby2ruby.rb', line 660

def process_match3(exp) # :nodoc:
  rhs = process(exp.shift)
  left_type = exp.first.sexp_type
  lhs = process(exp.shift)

  if ASSIGN_NODES.include? left_type then
    "(#{lhs}) =~ #{rhs}"
  else
    "#{lhs} =~ #{rhs}"
  end
end

#process_module(exp) ⇒ Object

:nodoc:



672
673
674
 
# File 'lib/ruby2ruby.rb', line 672

def process_module(exp) # :nodoc:
  "#{exp.comments}module #{util_module_or_class(exp)}"
end

#process_next(exp) ⇒ Object

:nodoc:



676
677
678
679
680
681
682
683
 
# File 'lib/ruby2ruby.rb', line 676

def process_next(exp) # :nodoc:
  val = exp.empty? ? nil : process(exp.shift)
  if val then
    "next #{val}"
  else
    "next"
  end
end

#process_nil(exp) ⇒ Object

:nodoc:



685
686
687
 
# File 'lib/ruby2ruby.rb', line 685

def process_nil(exp) # :nodoc:
  "nil"
end

#process_not(exp) ⇒ Object

:nodoc:



689
690
691
 
# File 'lib/ruby2ruby.rb', line 689

def process_not(exp) # :nodoc:
  "(not #{process exp.shift})"
end

#process_nth_ref(exp) ⇒ Object

:nodoc:



693
694
695
 
# File 'lib/ruby2ruby.rb', line 693

def process_nth_ref(exp) # :nodoc:
  "$#{exp.shift}"
end

#process_op_asgn1(exp) ⇒ Object

:nodoc:



697
698
699
700
701
702
703
704
705
 
# File 'lib/ruby2ruby.rb', line 697

def process_op_asgn1(exp) # :nodoc:
  # [[:lvar, :b], [:arglist, [:lit, 1]], :"||", [:lit, 10]]
  lhs = process(exp.shift)
  index = process(exp.shift)
  msg = exp.shift
  rhs = process(exp.shift)

  "#{lhs}[#{index}] #{msg}= #{rhs}"
end

#process_op_asgn2(exp) ⇒ Object

:nodoc:



707
708
709
710
711
712
713
714
715
716
 
# File 'lib/ruby2ruby.rb', line 707

def process_op_asgn2(exp) # :nodoc:
  # [[:lvar, :c], :var=, :"||", [:lit, 20]]
  lhs = process(exp.shift)
  index = exp.shift.to_s[0..-2]
  msg = exp.shift

  rhs = process(exp.shift)

  "#{lhs}.#{index} #{msg}= #{rhs}"
end

#process_op_asgn_and(exp) ⇒ Object

:nodoc:



718
719
720
721
722
723
 
# File 'lib/ruby2ruby.rb', line 718

def process_op_asgn_and(exp) # :nodoc:
  # a &&= 1
  # [[:lvar, :a], [:lasgn, :a, [:lit, 1]]]
  exp.shift
  process(exp.shift).sub(/\=/, '&&=')
end

#process_op_asgn_or(exp) ⇒ Object

:nodoc:



725
726
727
728
729
730
 
# File 'lib/ruby2ruby.rb', line 725

def process_op_asgn_or(exp) # :nodoc:
  # a ||= 1
  # [[:lvar, :a], [:lasgn, :a, [:lit, 1]]]
  exp.shift
  process(exp.shift).sub(/\=/, '||=')
end

#process_or(exp) ⇒ Object

:nodoc:



732
733
734
 
# File 'lib/ruby2ruby.rb', line 732

def process_or(exp) # :nodoc:
  "(#{process exp.shift} or #{process exp.shift})"
end

#process_postexe(exp) ⇒ Object

:nodoc:



736
737
738
 
# File 'lib/ruby2ruby.rb', line 736

def process_postexe(exp) # :nodoc:
  "END"
end

#process_redo(exp) ⇒ Object

:nodoc:



740
741
742
 
# File 'lib/ruby2ruby.rb', line 740

def process_redo(exp) # :nodoc:
  "redo"
end

#process_resbody(exp) ⇒ Object

:nodoc:



744
745
746
747
748
749
750
751
752
753
754
755
756
 
# File 'lib/ruby2ruby.rb', line 744

def process_resbody exp # :nodoc:
  args = exp.shift
  body = finish(exp)
  body << "# do nothing" if body.empty?

  name =   args.lasgn true
  name ||= args.iasgn true
  args = process(args)[1..-2]
  args = " #{args}" unless args.empty?
  args += " => #{name[1]}" if name

  "rescue#{args}\n#{indent body.join("\n")}"
end

#process_rescue(exp) ⇒ Object

:nodoc:



758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
 
# File 'lib/ruby2ruby.rb', line 758

def process_rescue exp # :nodoc:
  body = process(exp.shift) unless exp.first.first == :resbody
  els  = process(exp.pop)   unless exp.last.first  == :resbody

  body ||= "# do nothing"
  simple = exp.size == 1 && !exp.resbody.block && exp.resbody.size <= 3

  resbodies = []
  until exp.empty? do
    resbody = exp.shift
    simple &&= resbody[1] == s(:array)
    simple &&= resbody[2] != nil && resbody[2].node_type != :block
    resbodies << process(resbody)
  end

  if els then
    "#{indent body}\n#{resbodies.join("\n")}\nelse\n#{indent els}"
  elsif simple then
    resbody = resbodies.first.sub(/\n\s*/, ' ')
    "#{body} #{resbody}"
  else
    "#{indent body}\n#{resbodies.join("\n")}"
  end
end

#process_retry(exp) ⇒ Object

:nodoc:



783
784
785
 
# File 'lib/ruby2ruby.rb', line 783

def process_retry(exp) # :nodoc:
  "retry"
end

#process_return(exp) ⇒ Object

:nodoc:



787
788
789
790
791
792
793
794
795
 
# File 'lib/ruby2ruby.rb', line 787

def process_return(exp) # :nodoc:
  # HACK return "return" + (exp.empty? ? "" : " #{process exp.shift}")

  if exp.empty? then
    return "return"
  else
    return "return #{process exp.shift}"
  end
end

#process_sclass(exp) ⇒ Object

:nodoc:



797
798
799
 
# File 'lib/ruby2ruby.rb', line 797

def process_sclass(exp) # :nodoc:
  "class << #{process(exp.shift)}\n#{indent(process_block(exp))}\nend"
end

#process_self(exp) ⇒ Object

:nodoc:



801
802
803
 
# File 'lib/ruby2ruby.rb', line 801

def process_self(exp) # :nodoc:
  "self"
end

#process_splat(exp) ⇒ Object

:nodoc:



805
806
807
808
809
810
811
 
# File 'lib/ruby2ruby.rb', line 805

def process_splat(exp) # :nodoc:
  if exp.empty? then
    "*"
  else
    "*#{process(exp.shift)}"
  end
end

#process_str(exp) ⇒ Object

:nodoc:



813
814
815
 
# File 'lib/ruby2ruby.rb', line 813

def process_str(exp) # :nodoc:
  return exp.shift.dump
end

#process_super(exp) ⇒ Object

:nodoc:



817
818
819
820
821
 
# File 'lib/ruby2ruby.rb', line 817

def process_super(exp) # :nodoc:
  args = finish exp

  "super(#{args.join(', ')})"
end

#process_svalue(exp) ⇒ Object

:nodoc:



823
824
825
826
827
828
829
 
# File 'lib/ruby2ruby.rb', line 823

def process_svalue(exp) # :nodoc:
  code = []
  until exp.empty? do
    code << process(exp.shift)
  end
  code.join(", ")
end

#process_to_ary(exp) ⇒ Object

:nodoc:



831
832
833
 
# File 'lib/ruby2ruby.rb', line 831

def process_to_ary(exp) # :nodoc:
  process(exp.shift)
end

#process_true(exp) ⇒ Object

:nodoc:



835
836
837
 
# File 'lib/ruby2ruby.rb', line 835

def process_true(exp) # :nodoc:
  "true"
end

#process_undef(exp) ⇒ Object

:nodoc:



839
840
841
 
# File 'lib/ruby2ruby.rb', line 839

def process_undef(exp) # :nodoc:
  "undef #{process(exp.shift)}"
end

#process_until(exp) ⇒ Object

:nodoc:



843
844
845
 
# File 'lib/ruby2ruby.rb', line 843

def process_until(exp) # :nodoc:
  cond_loop(exp, 'until')
end

#process_valias(exp) ⇒ Object

:nodoc:



847
848
849
 
# File 'lib/ruby2ruby.rb', line 847

def process_valias(exp) # :nodoc:
  "alias #{exp.shift} #{exp.shift}"
end

#process_when(exp) ⇒ Object

:nodoc:



851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
 
# File 'lib/ruby2ruby.rb', line 851

def process_when(exp) # :nodoc:
  src = []

  if self.context[1] == :array then # ugh. matz! why not an argscat?!?
    val = process(exp.shift)
    exp.shift # empty body
    return "*#{val}"
  end

  until exp.empty?
    cond = process(exp.shift).to_s[1..-2]
    code = indent(finish(exp).join("\n"))
    code = indent "# do nothing" if code =~ /\A\s*\Z/
    src << "when #{cond} then\n#{code.chomp}"
  end

  src.join("\n")
end

#process_while(exp) ⇒ Object

:nodoc:



870
871
872
 
# File 'lib/ruby2ruby.rb', line 870

def process_while(exp) # :nodoc:
  cond_loop(exp, 'while')
end

#process_xstr(exp) ⇒ Object

:nodoc:



874
875
876
 
# File 'lib/ruby2ruby.rb', line 874

def process_xstr(exp) # :nodoc:
  "`#{process_str(exp)[1..-2]}`"
end

#process_yield(exp) ⇒ Object

:nodoc:



878
879
880
881
882
883
884
885
886
887
888
889
 
# File 'lib/ruby2ruby.rb', line 878

def process_yield(exp) # :nodoc:
  args = []
  until exp.empty? do
    args << process(exp.shift)
  end

  unless args.empty? then
    "yield(#{args.join(', ')})"
  else
    "yield"
  end
end

#process_zsuper(exp) ⇒ Object

:nodoc:



891
892
893
 
# File 'lib/ruby2ruby.rb', line 891

def process_zsuper(exp) # :nodoc:
  "super"
end

#re_opt(options) ⇒ Object

Return the appropriate regexp flags for a given numeric code.



1023
1024
1025
1026
1027
 
# File 'lib/ruby2ruby.rb', line 1023

def re_opt options
  bits = (0..8).map { |n| options[n] * 2**n }
  bits.delete 0
  bits.map { |n| Regexp::CODES[n] }.join
end

#rewrite_attrasgn(exp) ⇒ Object

Rewriters:



898
899
900
901
902
903
904
905
 
# File 'lib/ruby2ruby.rb', line 898

def rewrite_attrasgn exp # :nodoc:
  if context.first(2) == [:array, :masgn] then
    exp[0] = :call
    exp[2] = exp[2].to_s.sub(/=$/, '').to_sym
  end

  exp
end

#rewrite_ensure(exp) ⇒ Object

:nodoc:



907
908
909
910
 
# File 'lib/ruby2ruby.rb', line 907

def rewrite_ensure exp # :nodoc:
  exp = s(:begin, exp) unless context.first == :begin
  exp
end

#rewrite_resbody(exp) ⇒ Object

:nodoc:



912
913
914
915
916
917
 
# File 'lib/ruby2ruby.rb', line 912

def rewrite_resbody exp # :nodoc:
  raise "no exception list in #{exp.inspect}" unless exp.size > 2 && exp[1]
  raise exp[1].inspect if exp[1][0] != :array
  # for now, do nothing, just check and freak if we see an errant structure
  exp
end

#rewrite_rescue(exp) ⇒ Object

:nodoc:



919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
 
# File 'lib/ruby2ruby.rb', line 919

def rewrite_rescue exp # :nodoc:
  complex = false
  complex ||= exp.size > 3
  complex ||= exp.resbody.block
  complex ||= exp.resbody.size > 3
  complex ||= exp.find_nodes(:resbody).any? { |n| n[1] != s(:array) }
  complex ||= exp.find_nodes(:resbody).any? { |n| n.last.nil? }
  complex ||= exp.find_nodes(:resbody).any? { |n| n[2] and n[2].node_type == :block }

  handled = context.first == :ensure

  exp = s(:begin, exp) if complex unless handled

  exp
end

#rewrite_svalue(exp) ⇒ Object

:nodoc:



935
936
937
938
939
940
941
942
943
944
 
# File 'lib/ruby2ruby.rb', line 935

def rewrite_svalue(exp) # :nodoc:
  case exp.last.first
  when :array
    s(:svalue, *exp[1][1..-1])
  when :splat
    exp
  else
    raise "huh: #{exp.inspect}"
  end
end

#splat(sym) ⇒ Object

Return a splatted symbol for sym.



1032
1033
1034
 
# File 'lib/ruby2ruby.rb', line 1032

def splat(sym)
  :"*#{sym}"
end

#util_dthing(type, exp) ⇒ Object

Utility method to generate something interpolated.



1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
 
# File 'lib/ruby2ruby.rb', line 1039

def util_dthing(type, exp)
  s = []

  # first item in sexp is a string literal
  s << dthing_escape(type, exp.shift)

  until exp.empty?
    pt = exp.shift
    case pt
    when Sexp then
      case pt.first
      when :str then
        s << dthing_escape(type, pt.last)
      when :evstr then
        s << '#{' << process(pt) << '}' # do not use interpolation here
      else
        raise "unknown type: #{pt.inspect}"
      end
    else
      raise "unhandled value in d-thing: #{pt.inspect}"
    end
  end

  s.join
end

#util_module_or_class(exp, is_class = false) ⇒ Object

Utility method to generate ether a module or class.



1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
 
# File 'lib/ruby2ruby.rb', line 1068

def util_module_or_class(exp, is_class=false)
  result = []

  name = exp.shift
  name = process name if Sexp === name

  result << name

  if is_class then
    superk = process(exp.shift)
    result << " < #{superk}" if superk
  end

  result << "\n"

  body = []
  begin
    code = process(exp.shift) unless exp.empty?
    body << code.chomp unless code.nil? or code.chomp.empty?
  end until exp.empty?

  unless body.empty? then
    body = indent(body.join("\n\n")) + "\n"
  else
    body = ""
  end
  result << body
  result << "end"

  result.join
end